Here I have TCL 10 SE, and today I'm going to show you how to block number on this device. So, first, you have to open your phone and the first method is: you have to select a contact which you want to block. Then you tap here and tap block numbers and block, and now this number is blocked and the second method you just can uh open your contacts list. Tab here go to the settings, and here you have this line, blocked numbers, and here you can add number you can add every number here. You don't need to add it to your contacts list. First, you can just type it here and the number will be locked and that's it, thanks for watching.
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Source : HardReset.Info